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PET bottle bottom material accumulation too thick
Fenómeno do problema
The material at the center of the bottle bottom accumulates too thick, the weight exceeds the standard, the bottom transparency is poor, and the drop test instead results in brittle cracking at that spot.
Análise das causas
Insufficient stretch rod downward pressure or too early blowing timing leaves the bottom material not fully stretched and spread thin; an unreasonable bottom design stretch ratio also causes material accumulation.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solução
①Adjust the stretch rod stroke and downward pressure depth; ②optimize the blowing start timing; ③check the bottom design stretch ratio; ④measure the bottom thickness distribution.; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Conclusão principal
Bottle bottom material accumulation is a manifestation of material distribution imbalance; stretching depth and blowing timing are the main adjustment means, and an overly thick bottom instead becomes the starting point of brittle cracking.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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